/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/IntrinsicCorrespondenceUtils.h
the Order of the edge EID about VID (counting CCW from the surface reference edge for this vertex). Note: this assumes that edge EID is adjacent to vertex VID - otherwise -1 is returned.
int32 GetEdgeOrder ( const int32 VID, const int32 SurfaceEID ) const